Evening star. [volume] (Washington, D.C.) 1854-1972, 1887-03-09
THE NEW FREE RRVns:E
ran Oh the Proposed Superstructur,
Of Steel or Wrought Iron.

Tne new bridge connecting West Washington
Win tne virginia shore OF the Potomac is to be
Dullt on the massive stone piers OF the AQueduct
on the following plan: Commencing at the north
end in West Washington, the new structure will
consist Of: One through span, OF about 100 feet,
over the Chesapeake and Ohio canal resting on
an abutment and pier to be built: about Io7
Ieet OF trestle over the existing north abutment;
nine deck-spans OF about la feet each over the
river, resting on eight piers and two abutments
already built; about 700 linear feet OF earth en-
bankment on the southern approach, the masonry
OF the south abutment to be carried up as retain
Ing wall TO sustain the end OF the embankment.
me sunstructuIe TO be built in addition TO that
now existing will be: An abutment and pier for
the 16O-roOt span at the north end OF the bridge
coping for the present piers and abutments, and q
retaining wall on the south abutment.
GENERAL CHARACTER OF BRIDGE.
The bridge and treste will be entirely OF wrought
iron or STEEL except the floor Joists flooring and
wheel guards, which will be OF wood All the spans
will be pin-connected trlsses. The upper and
lower chords will be horizontal and parallel The
design for the bridge is To be submitted by the
pldder SUBJECT TO the limitations contained In the
specif1catlOnS. The clear width OF the roadway
will be 24 feet, With two sidewalks, each six feet
wide, In the clear. On the through span there
shall be a clear head room OF II feet above the
nOor. The through span must be arranged SO as
10 give clear head room over the water surface
OF the chesapeake and Ohio canal of IA feet to the
VIII consist OF Two truSses centered at the
Sides OF the roadway, the sidewalks being placed
outside the trusSes and supported by an Overhang-
ing part OF the floor BEAM
THE SOUTHERN APPROACH,
which Is to be built under separate contract will
be an embankment of suitable earth, filled over
the existing causeway to such grade as the engi-
neer may designate, meeting the grade of the
roadway at the bridge. The embanknent viii be
SO feet wide on top, with sde-slOpes OF to J. The
nliing VIII be put On in layers or about 5 feet 20
De lower at the center than at the sides. Such
portions OF the Side-SlOpeS as the engineer may
deem necessary are TO be paved with paving OF
Potomac or other suitable quarry stone, to be not
less than inches deep, the upper surfaces form
Ing the slOpe) 10 be comparatively smooth. The
stones are to be laid on edge the length parallel
TO The roadway, and so as u form a durable and
substantial slope-pav1ng. All interstices are TO
be filled In with spawls or sand.
REMOVAL OF EXISTING WOODEN SUPERsTRUCTURE.
The existing wooden superstructure OF the
bridge and approaches, except the lumber Of the
canal trunk, trestle and such bracing as may be
taken out by the government, is to be removed by
and Will then become the property OF the cOntrac-
Tor. All timber, iron, and other materials pertain
Ing to the old bridge are TO be removed from the
line Of the work, but sound timber taken from IL
may be used for flooring the new bridge, II in the
opinion OF the engineer it is suitable The cost OF
removing the Old work will be included in the
price for the erection Of the new. The Old bridge
is not to be Kept open for travel during the con-
Struct1On OF the new one.